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Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy / Y. P. Xiao in Materials and corrosion, Vol. 63 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 127–133 Titre : Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 127–133 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al–Zn–Mg–Cu–Zr  alloy  containing  Sc;  electrochemical  impedance  spectroscopy  (EIS);  exfoliation  corrosion;  equivalent  circuit  (EC) Résumé : The exfoliation corrosion behavior of an Al–Zn–Mg–Cu–Zr alloy containing Sc artificially aged at 120 °C for 24 h is studied by macroscopic observation techniques and electrochemical impedance spectroscopy (EIS) measurements. After 48 h immersion, the blisters start bursting and delamination initiates, along with the appearance of two time constants in the impedance diagrams. According to the simulation by equivalent circuit, the corrosion rate decreases sharply and then reaches a steady state, which is due to the change of the solution pH and oxide layer thickness, as well as the accumulation of corrosion products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005696/abstract [article] Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy [texte imprimé] / Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur . - 2012 . - pp. 127–133. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 2 (Fevrier 2012) . - pp. 127–133 Mots-clés : Al–Zn–Mg–Cu–Zr  alloy  containing  Sc;  electrochemical  impedance  spectroscopy  (EIS);  exfoliation  corrosion;  equivalent  circuit  (EC) Résumé : The exfoliation corrosion behavior of an Al–Zn–Mg–Cu–Zr alloy containing Sc artificially aged at 120 °C for 24 h is studied by macroscopic observation techniques and electrochemical impedance spectroscopy (EIS) measurements. After 48 h immersion, the blisters start bursting and delamination initiates, along with the appearance of two time constants in the impedance diagrams. According to the simulation by equivalent circuit, the corrosion rate decreases sharply and then reaches a steady state, which is due to the change of the solution pH and oxide layer thickness, as well as the accumulation of corrosion products. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005696/abstract

Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy / Y. P. Xiao in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 421–430 Titre : Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy Type de document : texte imprimé Auteurs : Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 421–430 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al_Zn_Mg_Cu_Zr_Sc  alloy;  exfoliation  corrosion;  heat  treatment;  electrochemical  impedance  spectroscopy;  polarization Résumé : Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of Al_Zn_Mg_Cu_Zr_Sc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr) and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, Al_Zn_Mg_Cu_Zr_Sc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005923/abstract [article] Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy [texte imprimé] / Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur . - 2012 . - pp. 421–430. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 421–430 Mots-clés : Al_Zn_Mg_Cu_Zr_Sc  alloy;  exfoliation  corrosion;  heat  treatment;  electrochemical  impedance  spectroscopy;  polarization Résumé : Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of Al_Zn_Mg_Cu_Zr_Sc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr) and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, Al_Zn_Mg_Cu_Zr_Sc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005923/abstract